See the following IRS page on Penalty Relief:
https://www.irs.gov/businesses/small-businesses-self-employed/penalty-relief
Under the circumstances, it seems that you have reasonable cause to get relief from the penalty, particularly if you have a statement from the trustee saying that the trustee failed to provide you with the Schedule K-1. You would then have to decide how much reimbursement from the trustee is appropriate since it's possible for you to have had the money that should have been used to pay the tax invested at a rate that would cover at least part of the interest rate charged by the IRS on the late tax payment.
